Notochlamys Cotton, 1930
COTTON, B. C. 1930. Pelecypoda of the "Flindersian" region, southern Australia, No. 1. Records of the South Australian Museum, 4 (2): 223-240, figures 1-15. [p. 233]
«NOTOCHLAMYS gen,. nov.
This genus is proposed for Chlamys anguineus Finlay = P. undulatus Sowerby. The radial sculpture of the two valves is dissimilar; the primary radials few (six or seven).
Differs from Equichlamys in having very unequal auricles, and from Mesopeplum in having the surface covered with fine shagreen sculpture and not concentric threads.» BERNARD CHARLES COTTON, 1930
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Pecten undulatus Sowerby; L. A. Reeve, 1852-1853, Monograph of the genus Pecten. In: L. A. Reeve (Ed.), 1843-1878, Conchologia Iconica, plate 20, figure 73.
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Notochlamys hexactes (Lamarck); H. H. Dijkstra & A. G. Beu, 2018, Living scallops of Australia and adjacent waters, figures 74A-74D.
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«Notochlamys Cotton, 1930
Notochlamys Cotton, 1930: 233. Type species (by original designation): Chlamys anguineus [sic] Finlay, 1927 (replacement name for Pecten undulatus G. B. Sowerby II, 1842, junior homonym of P. undulatus Nilsson, 1827) (= Pecten hexactes [Péron] Lamarck, 1819); Recent, southwestern Australia.
Diagnosis. Strongly plicate, medium-sized Pedini with obvious shagreen microsculpture throughout ontogeny, and with obvious sculpture of few, major radial plicae; most specimens with secondary radial riblets; with highly unequal auricles (anterior much longer than posterior), moderately prominent resilial and dorsal teeth, internal costae with carinate edges near ventral margin, byssal notch deep, ctenolium well-developed
Distribution. ?Pliocene–Recent (Beu & Darragh, 2001). Southwestern, southern and southeastern Australia, living in the subtidal to sublittoral zones beneath rocks or amongst rubble. Earlier (Eocene–Miocene) members assigned to the genus provisionally by Beu & Darragh (2001) are of uncertain taxonomic position.
Discussion. Hertlein (1969: N366) considered Notochlamys to be a junior synonym of the subgenus Mesopeplum Iredale, 1929, placed in Semipallium Jousseaume in Lamy, 1928. Waller (1991: 31) suggested that these three groups are not synonyms or even closely related and have very different ancestries. Mesopeplum (with entirely far-set commarginal microsculpture) is now placed in Mesopeplini, and Notochlamys and Semipallium (both of which have shagreen microsculpture) are considered to be distinct genera in Pedini (Waller, 1991: 31; Beu & Darragh, 2001: 58; Waller, 2006a: 20).»
DIJKSTRA, H. H. & A. G. BEU. 2018. Living scallops of Australia and adjacent waters (Mollusca: Bivalvia: Pectinoidea: Propeamussiidae, Cyclochlamydidae and Pectinidae). Records of the Australian Museum, 70 (2): 113-330, figs. 1-102.[p. 248, 249]
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